Systems and methods for filtering unwanted sounds from a conference call using voice synthesis

ABSTRACT

To filter unwanted sounds from a conference call, a first voice signal is captured by a first device during a conference call and converted into corresponding text, which is then analyzed to determine that a first portion of the text was spoken by a first user and a second portion of the text was spoken by a second user. If the first user is relevant to the conference call while the second user is not, the first voice signal is prevented from being transmitted into the conference call, the first portion of text is converted into a second voice signal using a voice profile of the first user to synthesize the voice of the first user, and the second voice signal is then transmitted into the conference call. The second portion of text is not converted into a voice signal, as the second user is determined not to be relevant.

BACKGROUND

This disclosure is directed to audio processing of conference calls. In particular, techniques are disclosed for identifying and filtering out unwanted sounds from a conference call.

SUMMARY

Audio, video, and virtual conferencing continue to play an important role in business and school environments. With many participants in such conferences located remotely from each other, often in places that do not afford them quiet or uninterrupted time to participate in conferences, unwanted sounds can often be heard on the conferences. One way to prevent transmission of such unwanted sounds is to perform active noise cancellation. However, this usually requires additional microphones to determine which sounds are made by a participant and which sounds are made by other sources. Many devices used by conference participants, or participants in any audio or video call, do not include multiple microphones and may not have the processing capabilities to perform active noise cancellation.

Systems and methods are disclosed herein for filtering unwanted sounds from a conference call. A voice profile of a first user is generated based on a first voice signal captured by a media device during a first conference call. The voice profile may be generated by identifying a base frequency of the first voice signal and determining a plurality of voice characteristics, such as pitch, intonation, accent, loudness, and speech rate. These data may be stored in association with the first user. During a second conference call, a second voice signal captured by the media device is analyzed to determine, based on the voice profile of the first user, whether the second voice signal includes the voice of a second user. If so, the second voice signal is prevented from being transmitted into the conference call. A voice profile of the second user may be generated from the second voice signal for future use.

In some embodiments, the second voice signal is captured using a microphone. In order to prevent the second voice signal from being transmitted into the conference call, the microphone may be muted for a predetermined period of time. Alternatively, transmission of captured audio into the conference call may be prevented for the predetermined period of time. After the predetermined period of time passes, a third voice signal may be captured and analyzed by the media device. If it is determined that the third voice signal no longer includes the second voice, the third voice signal is allowed to be transmitted into the conference call. In some embodiments, rather than waiting a predetermined period of time, audio may be continuously sampled. Once the sampled audio is determined to no longer include the voice of the second user, the microphone may be unmuted and/or transmission of the voice signal into the conference call may be permitted.

Other methods of generating voice profiles may also be employed. For example, the first voice signal may be transcribed into corresponding text. Subject matter of the text is then identified and compared with a user profile associated with a first user. The user profile may contain a list of subjects with which the first user is familiar. If the identified subject matter matches a subject on the list of subjects, then the first voice signal is identified as corresponding to the first user. As another example, after transcribing the first voice signal into corresponding text, the text may be processed to determine a language usage level. For example, a language usage level may be based on vocabulary (e.g., size and/or complexity of words), rate of speech, grammatical structures, or other linguistic features. On average, a child will have a lower language usage level than an adult. Thus, the language usage level can be used to estimate the age of the speaker. The usage level is compared with the age of the first user. If the usage level matches the age of the first user, then the first voice signal is identified as corresponding to the first user.

Unwanted sounds may be filtered from a conference call using speech synthesis. A first voice signal is captured by a first device during a conference call. The first voice signal is converted into corresponding text, which is then analyzed to determine that a first portion of the text was spoken by a first user and a second portion of the text was spoken by a second user. The relevance of each identified user to the conference call is determined. If the first user is relevant to the conference call while the second user is not, the first voice signal is prevented from being transmitted into the conference call, the first portion of text is converted into a second voice signal using a voice profile of the first user to synthesize the voice of the first user, and the second voice signal is then transmitted into the conference call. The second portion of text is not converted into a voice signal, as the second user is not relevant to the conference call.

To determine whether a user is relevant to the conference call, a profile of each user is retrieved. A subject of the conference call is identified, and it is determined, based on the profiles, whether each user is familiar with the subject of the conference call. If the first user is familiar with the subject of the conference call, then the first user is deemed relevant to the conference call. If, on the other hand, the second user is not familiar with the subject of the conference call, then the second user is not relevant to the conference call, and the text spoken by the second user need not be converted into a voice signal. Another way to determine whether a user is relevant to the conference call is to determine whether the user received an invitation to the conference call. If a user did not receive an invitation to the conference call, then that user is not relevant to the conference call, whereas a user that was invited to the conference call is relevant to the conference call.

If both the first and second users are determined to be relevant to the conference call, then, in addition to converting the first portion of text into a second voice signal that synthesizes the voice of the first user, the second portion of text is also converted into a third voice signal that synthesizes the voice of the second user. These two voice signals are then transmitted separately into the conference call. In some embodiments, other participants in the conference call are presented with an option to select whether to listen to the second voice signal or the third voice signal. In some embodiments, where both voice signals are transmitted into the conference call, a user interface element, such as a dialog box, may be presented to other participants in the conference call allowing each user to select to which of the two voice signals he or she would like to listen. In some cases, the transcribed text may be transmitted to a remote server at which the voice synthesis occurs. This may reduce the load on the media device to allow for a smoother call experience (e.g., less video or audio buffering).

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and advantages of the disclosure will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout, and in which:

FIG. 1 shows (a) an exemplary scenario in which unwanted sounds are present during a conference call, and (b) data associated with each sound, in accordance with some embodiments of the disclosure;

FIG. 2 shows an exemplary scenario in which transcribed text of a voice signal is synthesized in the voice of a user, in accordance with some embodiments of the disclosure;

FIG. 3 shows an exemplary media device display and user interface element allowing a user to select to which of a plurality of voice signals being transmitted by the same media device into a conference call the user would like to listen, in accordance with some embodiments of the disclosure;

FIG. 4 is a block diagram showing components and data flow therebetween of a system for filtering unwanted sounds from a conference call, in accordance with some embodiments of the disclosure;

FIG. 5 is a block diagram showing components and data flow therebetween of a system for filtering unwanted sounds from a conference call using speech synthesis, in accordance with some embodiments of the disclosure;

FIG. 6 is a flowchart representing a process for filtering unwanted sounds from a conference call, in accordance with some embodiments of the disclosure;

FIG. 7 is a flowchart representing a process for allowing transmission of audio into a conference call after detecting an unwanted sound, in accordance with some embodiments of the disclosure;

FIG. 8 is a flowchart representing a process for generating a voice profile of a user, in accordance with some embodiments of the disclosure;

FIG. 9 is a flowchart representing a second process for generating a voice profile of a user, in accordance with some embodiments of the disclosure;

FIG. 10 is a flowchart representing a third process for generating a voice profile of a user, in accordance with some embodiments of the disclosure;

FIG. 11 is a flowchart representing a process for filtering unwanted sounds from a conference call using speech synthesis, in accordance with some embodiments of the disclosure;

FIG. 12 is a flowchart representing a process for determining whether a user is relevant to a conference call, in accordance with some embodiments of the disclosure;

FIG. 13 is a flowchart representing a second process for determining whether a user is relevant to a conference call; and

FIG. 14 is a flowchart representing a process for presenting participants in a conference call with an option to select to listen to one of two voice signals, in accordance with some embodiments of the disclosure.

DETAILED DESCRIPTION

FIG. 1 shows (a) an exemplary scenario in which unwanted sounds are present during a conference call, and (b) data associated with each sound, in accordance with some embodiments of the disclosure. User P1 100 is participating in a conference call using media device 102. For example, media device 102 may be a phone, a cell phone, a smartphone, a tablet, a laptop computer, a desktop computer, or any other device capable of being used to participate in an audio or video call. During a prior conference call, a voice signal 104 corresponding to the voice of P1 100 was used to generate a voice profile 106 of P1, which is stored in profile list or database 108. For example, a one- or two-second sample of the voice of P1 100 may have been captured and used to generate a voice profile. In some cases, several such samples may be captured, and an average of each voice characteristic identified therein used to generate the voice profile of P1. Alternatively or additionally, media device 102 may prompt P1100 to train media device 102 to recognize his or her voice. P1 100 may, for example, be prompted by media device 102 to read a predefined passage of text. Media device 102 may build a voice profile of P1 100 based on audio captured while P1 100 reads the passage of text.

During the current conference call, a second person P2 110 enters the vicinity of P1 100, such that sounds made by P2 110 may be picked up by media device 102 and transmitted into the conference call. First voice signal 112 is captured by media device 102 and compared to stored voice profiles in profile list 108. Based on the comparison, media device 102 determines that voice signal 112 matches voice profile 106 of P1 100. Media device 102 may store the captured voice signal 112 in a data field 114 associated with voice profile 106. Voice signal 112 is allowed to be transmitted into the conference call because it matches the voice profile 106 of P1 100.

Second voice signal 116 is also captured by media device 102. Voice signal 116 was generated by P2 110. For example, second voice signal 116 may be captured immediately prior to, or immediately following, first voice signal 112. Media device 102 compares voice signal 116 to known voice profiles in profile list 108. Media device 102 determines that voice signal 116 does not match any known voice profiles. Media device 102 may nevertheless track the captured voice signal 116 in a data field 118 associated with an unknown user. Since it does not match voice profile 106 of P1 100, voice signal 116 is not allowed to be transmitted into the conference call. In another example, second voice signal 116 is captured concurrently with first voice signal 112. Media device 102 may determine that additional sounds that do not correspond to the voice profile of P1 100 are contained in the concurrently captured audio, and prevent transmission of the captured audio into the conference call. Media device 102 prevents transmission by, for example, muting a microphone of media device 102 for a predetermined period of time, such as 5 seconds. After the predetermined period of time, media device 102 may determine if voice signals that do not match voice profile 106 are still present. If so, media device 102 may wait for additional time. If not, media device 102 may allow voice signals to be transmitted into the conference call again. For example, P1 100 speaks for five seconds. The corresponding voice signal is transmitted into the conference call. P2 110 then speaks for ten seconds. Recognizing that the voice of P2 110 does not match the voice profile of P1 100, media device 102 prevents transmission of captured audio data, or mutes the microphone of media device 102, for the predetermined period of five seconds. After five seconds, media device 102 again determines that a voice other than that of P1 100 is speaking, and again prevents transmission of captured audio data, or mutes a microphone of media device 102, for an additional five seconds.

Another method of filtering unwanted sounds may be accomplished by transcribing a voice signal into corresponding text. Media device 102 may transcribe voice signal 112 into corresponding text. Using natural language processing, media device 102 may determine a language usage level. For example, if only small, simple words are used, the language usage level is determined to be low, like that of a young child. If larger and/or technical words are used, the language usage level is determined to be higher, like that of an educated adult. Media device 102 may compare the language usage level with user profile data 120. User profile data 120 includes age data 122 for each user. For example, P1 100 may be twenty-five years old, while P2 110 is only seven years old. Based on the context of the conference call, media device 102 may determine which portion of the transcribed text should be transmitted into the conference call. For example, if the conference call is a business meeting, text spoken by P1may be transmitted, while if the conference call is a school class session text spoken by P2 may be transmitted. Alternatively or additionally, media device 102 may determine a subject matter of each portion of the text. User profile data 120 may also include subjects data 124, which lists the subjects with which each user is familiar. If the subject of the text matches a subject of the conference call, that portion of the text is allowed to be transmitted.

For example, P1 100 may be participating in a conference call related to engineering a device. P1 100 may say “Based on these specifications, the device requires several independent processors,” which is transcribed into text 126. P2 110 may then say “Dad, can you help with this thing?” which is transcribed into text 128. Media device 102 may process text 126 and identify the complexity of the words contained in text 126, such as “specifications,” “device,” and “independent.” Media device 102 may determine that these are complex words based on length and average usage of each word in normal speech. Media device 102 may determine that the speaker of text 126—P1 100—has a high language usage level, indicating that P1 100 is between 24 and 40 years old. Media device 102 may similarly process text 128 and determine that the words contained in text 128 are relatively simple words or phrases. For example, the phrase “this thing” is an indefinite phrase that is more likely to be used by a child to describe an object than by an adult, who would be more likely to use a more exact term to describe the object. Additionally, media device 102 may determine that text 128 is a question posed to another individual identified by the speaker as “Dad.” This may also serve to indicate a low language usage level, as children are more likely to address simple questions to their parents than are adults. Media device 102 may then determine that the speaker of text 128—P2 110—has a low language usage level, indicating that P2 110 is a child between 5 and 10 years old.

FIG. 2 shows an exemplary scenario in which transcribed text of a voice signal is synthesized in the voice of a user, in accordance with some embodiments of the disclosure. To transmit the text into the conference call, media device 102 may retrieve a voice profile of the user that spoke the portion of text. Using the voice profile, media device 102 may synthesize the voice of that user into a second voice signal. Methods of synthesizing a voice are described in commonly assigned U.S. patent application Ser. No. 15/931,074, entitled “Systems and Methods for Generating Synthesized Speech Responses to Voice Inputs,” filed May 13, 2020, which is hereby incorporated herein by reference in its entirety. Media device 102 then transmits the second voice signal into the conference call. In some embodiments, the transcribed text may be transmitted by media device 102 and synthesized in the voice of the user by a server associated with the conference call, or by participant media devices.

Media device 102 may, simultaneously or in sequence, capture voice signal 200 and voice signal 202. Voice signal 200 may represent speech of P1 100 and voice signal 202 may represent speech of P2 110. For example, P1 100 may be participating in a conference call and may say “The project will be completed by Friday.” P2 110 may, simultaneously with P1 100, or right before or right after P1 100 speaks, say “Can I have some pizza?” Media device 102, using speech-to-text transcription engine 204, transcribes the combined voice signal into corresponding text 206 and, using natural language processing, determines whether a portion of the text was spoken by a first user and another portion of the text was spoken by a second user. Each portion of the text may be analyzed separately to determine which portion should be transmitted into the conference call. For example, media device 102 may identify portion 208 corresponding to the speech of P1 100 and portion 210 corresponding to the speech of P2 110. The portions may be identified based on context, such as subject matter of each portion, language usage level of each portion, or voice characteristics of each portion. Media device 102 may determine that portion 208 was spoken by P1 100 and/or is relevant to the conference call. For example, the subject matter of each portion of text may be compared to a user profile listing subjects with which each respective user is familiar. If the subject matter of a portion matches the list of subjects for a particular user, that user may be identified as the speaker of that portion. Media device 102 retrieves voice profile 106 of P1 100 from profile list 108. Audio processor 212, which may be part of media device 102, located at a remote server, or may be part of a media device used by another participant in the conference call, uses the retrieved voice profile of P1 100 to synthesize text portion 208 in the voice of P1 100. The resulting voice signal 214 is then transmitted into the conference call. Portion 210, which is not correspond to P1 100 or to any user that is relevant to the conference call, is not synthesized into a voice signal.

In some cases, the subject matter of each portion may be compared with a subject matter of the conference call to determine whether each portion is relevant to the conference call. For example, in some cases, more than one person may join a conference call from the same media device. If the portions of text spoken by each user are determined to be relevant to the conference call (based on subject, age of the user, etc.), each portion of text may be separately synthesized into a voice signal using a respective voice profile of each user. The voice signals are then separately transmitted into the conference call.

FIG. 3 shows an exemplary media device display and user interface element allowing a user to select to which of a plurality of voice signals being transmitted by the same media device into a conference call the user would like to listen, in accordance with some embodiments of the disclosure. Media device 300 displays a video conference call on display 302. Display 302 may be divided into sections for each other conference participant. For example, participant John is displayed in portion 304 and participant Mary is displayed in portion 306. If multiple voices are detected in an audio stream for John, dialog box 308 may be displayed. Dialog box 308 offers the user of media device 300 an option to select which voice in the audio stream from John the user of media device 300 wants to hear. Media device 300 may process the audio to transcribe and synthesize the portions of the audio stream from participant John to generate a voice signal for the selected voice. Alternatively, a remote server may perform the transcription and speech synthesis, or the media device used by John may perform these functions and separately transmit each voice signal into the conference call. As another alternative, the remote server may only transmit text to each participant's media device, and each participant's media device then performs the speech synthesis functions. This reduces the bandwidth needed for the conference call.

FIG. 4 is a block diagram showing components and data flow therebetween of a system for filtering unwanted sounds from a conference call, in accordance with some embodiments of the disclosure. Audio input circuitry 400 receives 402 a first voice signal during a first conference call. Audio input circuitry 400 may be part of a media device on which the system of the present disclosure is implemented, or may be a separate device, such as an Amazon Echo® or Google Home® device, or any other device capable of receiving and relaying user input to a media device. Audio input circuitry 400 may be a data interface such as a Bluetooth module, WiFi module, or other suitable data interface through which data entered on another device or audio data captured by another device can be received. Alternatively, audio input circuitry 400 may include a microphone through which audio information is captured directly. Audio input circuitry 400 may convert the audio to a digital format such as WAV. Audio input circuitry 400 transmits 404 the first voice signal to control circuitry 406. Control circuitry 406 may be based on any suitable processing circuitry. As referred to herein, processing circuitry should be understood to mean circuitry based on one or more microprocessors, microcontrollers, digital signal processors, programmable logic devices, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), etc., and may include a multi-core processor (e.g., dual-core, quad-core, hexa-core, or any suitable number of cores) or supercomputer. In some embodiments, processing circuitry may be distributed across multiple separate processors or processing units, for example, multiple of the same type of processing units (e.g., two Intel Core i7 processors) or multiple different processors (e.g., an Intel Core i5 processor and an Intel Core i7 processor).

The first voice signal is received by audio processing circuitry 408. Audio processing circuitry 408 may be any suitable circuitry configured to perform audio analysis functions, such as frequency domain analysis, level and gain analysis, harmonic distortion analysis, etc. Audio processing circuitry 408 analyzes the first voice signal to identify a base frequency of the voice represented by the first voice signal, as well as other voice characteristics such as pitch, intonation, accent, loudness, and rate. Audio processing circuitry 408 transmits 410 the base frequency and voice characteristics to memory 412 for storage in a voice profile associated with the user. In some embodiments, voice profiles are stored remotely. Audio processing circuitry 408 may therefore transmit 414 the base frequency and voice characteristics to transceiver circuitry 416. Transceiver circuitry 416 may be a network connection such as an Ethernet port, WiFi module, or any other data connection suitable for communicating with a remote server. Transceiver circuitry 416 then transmits 418 the base frequency and voice characteristics to user profile database 420.

During a second conference call in which the user is participating, subsequent to the first conference call, audio input circuitry 400 receives 422 a second voice signal. Audio input circuitry 400 transmits 424 the second voice signal to control circuitry 406, where audio processing circuitry 408 receives and analyzes the second voice signal. Audio processing circuitry 408 requests 426 the voice profile of the user from memory 412 and receives 428, in response to the request, the voice profile of the user. In embodiments where the voice profile is stored in a remote database, audio processing circuitry 408 transmits 430 the request to transceiver circuitry 416, which in turn transmits 432 the request to user profile database 420. In response, transceiver circuitry 416 receives 434 the requested voice profile of the user and in turn transmits 436 the voice profile of the user to audio processing circuitry 408.

Once the voice profile of the user has been retrieved, audio processing circuitry 408 compares the base frequency and voice characteristics of the voice represented by the second voice signal to the voice profile of the user. If the base frequency and voice characteristics of the second voice signal do not match the voice profile of the user, audio processing circuitry 408 prevents transmission of the second voice signal into the conference call. For example, audio processing circuitry 408 may transmit 438 a signal to audio input circuitry 400 to mute a microphone of audio input circuitry 400 for a predetermined period of time, such as five seconds. Alternatively, the signal may cause audio input circuitry 400 to stop transmitting audio data to control circuitry 406 for the predetermined period of time. The signal may be a data packet, which may require the transmission of a second data packet at the end of the predetermined period of time to reenable audio input circuitry 408. Alternatively, the signal may be a voltage level that remains constant at the signaling voltage level during the predetermined period of time, after which the level changes. At the end of the predetermined period of time, a third voice signal may be received. If the third voice signal still does not match the voice profile of the user, transmission may again be prevented for the predetermined period of time.

If the second voice signal does match the voice profile of the user, or if any subsequent voice signal received after transmission was prevented for the predetermined period of time, audio processing circuitry 408 transmits 440 the appropriate voice signal to transceiver circuitry 416. Transceiver circuitry 416 in turn transmits 442 the voice signal into the conference call.

FIG. 5 is a block diagram showing components and data flow therebetween of a system for filtering unwanted sounds from a conference call using speech synthesis, in accordance with some embodiments of the disclosure. Audio input circuitry 400 receives 500 a voice signal. Audio input circuitry 400 transmits 502 the voice signal to control circuitry 406 where it is received by audio processing circuitry 408. Audio processing circuitry 408 may include natural language processing circuitry. Audio processing circuitry 408 transcribes the voice signal into corresponding text and, using the natural language processing circuitry, identifies a subject of the text. Audio processing circuitry 408 then requests 504 and receives 506 a profile of the user from memory 412 that includes a list of subjects with which the user is familiar. If user profiles are stored remotely, audio processing circuitry 408 may transmit 508 the request for the user profile to transceiver circuitry 416, which in turn transmits 510 the request to user profile database 420. Transceiver circuitry 416 then receives 512, in response to the request, the user profile and in turn transmits 514 the user profile to audio processing circuitry 408. Audio processing circuitry 408 compares the subject of the text with the list of subjects with which the user is familiar. If the subject of the text matches a subject on the list, then audio processing circuitry 408 uses the voice profile of the user to synthesize a voice signal in the user's voice corresponding to the transcribed text. The synthesized voice signal is then transmitted 516 to transceiver circuitry 416 for transmission 518 into the conference call.

FIG. 6 is a flowchart representing an illustrative process 600 for filtering unwanted sounds from a conference call, in accordance with some embodiments of the disclosure. Process 600 may be implemented on control circuitry 406. In addition, one or more actions of process 600 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 602, control circuitry 406 generates a voice profile of a first user of a media device based on a first voice signal captured by the media device during a first conference call. The first voice signal may be captured by a microphone of the media device or may be captured by another device with which audio input circuitry 400 communicates. The first voice signal is analyzed by audio processing circuitry 408 to identify audio and voice characteristics of the first voice signal. The identified characteristics are stored in a voice profile of the user.

At 604, control circuitry 406, using audio processing circuitry 408, analyzes a second voice signal captured by the media device during a second conference call. At 606, control circuitry 406 compares the second voice signal to the voice profile. For example, control circuitry 406 compares the base frequency, pitch, intonation, and accent of the second voice signal with the base frequency, pitch, intonation, and accent stored in the voice profile. At 608, control circuitry 406 determines whether the second voice signal includes a voice of a second user different from the first user. For example, if the base frequency, pitch, intonation, and accent of the second voice signal do not match the voice profile of the user, then the second voice signal is determined to include a voice other than the voice of the first user.

If the second voice signal includes the voice of a second user (“Yes” at 608), then, at 610, control circuitry 406 prevents the second voice signal from being transmitted into the conference call. For example, control circuitry 406 may send a signal to audio input circuitry 400 to prevent the capture of voice signals or the transmission of captured voice signals to control circuitry 406 for a predetermined period of time, such as five seconds. Alternatively, control circuitry 406 may prevent audio processing circuitry 408 from transmitting voice signals into the conference call via transceiver circuitry 416. If, however, the second voice signal does not include the voice of a second user, but only the voice of the first user (“No” at 608), then, at 612, control circuitry 406 transmits the second voice signal into the conference call.

The actions and descriptions of FIG. 6 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 6 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 7 is a flowchart representing an illustrative process 700 for allowing transmission of audio into a conference call after detecting an unwanted sound, in accordance with some embodiments of the disclosure. Process 700 may be implemented on control circuitry 406. In addition, one or more actions of process 700 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 702, control circuitry 406, using audio processing circuitry 408, analyzes a third voice signal captured during the second conference call. This may be a similar analysis to that described above in connection with FIG. 6. At 704, control circuitry 406 determines whether the third voice signal no longer includes the second voice. If not (“No” at 704), then, at 706, control circuitry 406 allows the third voice signal to be transmitted into the conference call. If the third voice signal still contains the second voice (“Yes” at 704), then, at 708, control circuitry 406 prevents the third voice signal from being transmitted into the conference call. This may be accomplished using methods described above in connections with FIGS. 4 and 6.

The actions and descriptions of FIG. 7 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 7 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 8 is a flowchart representing an illustrative process 800 for generating a voice profile of a user, in accordance with some embodiments of the disclosure. Process 800 may be implemented on control circuitry 406. In addition, one or more actions of process 800 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 802, control circuitry assigns a first captured voice to the variable Voice_(current). At 804, control circuitry 406, using audio processing circuitry 408, identifies a base frequency of Voice_(current). For example, control circuitry 406 may analyze a frequency spectrum of Voice_(current) to determine a primary harmonic frequency of the voice. At 806, control circuitry 406 determines a plurality of voice characteristics, such as pitch, intonation, accent, loudness, and rate. For example, control circuitry 406 may compare vowel sounds spoken in Voice_(current) with a set of known accents to determine an accent with which the speech represented by Voice_(current) was spoken. Audio amplitude may be analyzed to determine loudness. Patterns of changes in loudness and frequency may be used to determine an intonation.

At 808, control circuitry 406 determines whether the first voice signal contains a second voice. For example, control circuitry 406 may determine if multiple base frequencies are present, or if words are spoken at different speeds. If so (“Yes” at 808), then, at 810, control circuitry 406 assigns the second voice to Voice_(current), and the analysis described above is performed for the second voice. If not (“No” at 808), then the process ends.

The actions and descriptions of FIG. 8 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 8 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 9 is a flowchart representing a second illustrative process 900 for generating a voice profile of a user, in accordance with some embodiments of the disclosure. Process 900 may be implemented on control circuitry 406. In addition, one or more actions of process 900 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 902, control circuitry 406, using audio processing circuitry 408, transcribes the first voice signal into corresponding text. This may be accomplished using any suitable speech-to-text techniques. At 904, control circuitry 406, using natural language processing functions of audio processing circuitry 408, identifies a subject matter of the text. For example, audio processing circuitry 408 may identify a grammatical structure of a first sentence and identify a subject of the first sentence. Audio processing circuitry 408 may continue this process for each detected sentence until a number of sentence subjects have been identified. Audio processing circuitry 408 may process the identified subjects to determine a subject matter to which all identified sentence subjects correspond.

At 906, control circuitry 406 initializes a counter variable N, setting its value to one, and a variable T representing the number of known users for whom voice profiles have been stored. At 908, control circuitry 406 compares the identified subject matter with a user profile associated with the N^(th) user. The user profile may include a list of subjects with which the N^(th) user is familiar. At 910, control circuitry 406 determines, based on the comparing, whether the identified subject matter matches a subject of the list of subjects. For example, the text corresponding to the first voice signal may be “Based on these specifications, the device requires several independent processors.” Control circuitry 406 may identify the words “specifications” and “processors” as relating to the subject of engineering. If so (“Yes” at 910), then, at 912, control circuitry 406 identifies the first voice signal as corresponding to the N^(th) user. For example, control circuitry 406 may compare this identified subject to the listing of subjects for each known user and determine that the N^(th) user is familiar with engineering. Based on this determination, control circuitry 406 identifies the first voice signal as corresponding to the N^(th) user. If the identified subject matter does not match a subject of the list of subjects with which the N^(th) user is familiar (“No” at 910), then, at 914, control circuitry 406 determines whether N is equal to T, meaning that the identified subject matter has been checked against the subject lists of all known users. If not (“No” at 914), then, at 916, control circuitry 406 increments the value of N by one, and processing returns to step 908. If so (“Yes” at 914), then, then process ends.

In order to determine if a user is familiar with an identified subject matter, control circuitry 406 may access a list of keywords associated with the identified subject matter. For example, if the identified subject matter is wireless networking, the list of keywords may include terms such as “WiFi,” “Layer 2,” “802.11,” “packet,” and “router.” Control circuitry 406 may monitor a threshold amount of speech of the first user, such as five minutes, and determine a frequency with which the first user speaks any of the words of the keyword list. If the first user speaks words on the keyword list at greater than a threshold frequency, control circuitry 406 may determine that the first user is familiar with the subject matter.

The actions and descriptions of FIG. 9 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 9 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 10 is a flowchart representing a third illustrative process 1000 for generating a voice profile of a user, in accordance with some embodiments of the disclosure. Process 1000 may be implemented on control circuitry 406. In addition, one or more actions of process 1000 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 1002, control circuitry 406 transcribes the first voice signal into corresponding text. This may be accomplished using known speech-to-text techniques, as stated above. At 1004, control circuitry 406, using natural language processing functions of audio processing circuitry 408, processes the text to determine a language usage level. For example, audio processing circuitry 408 may analyze the size of each word, the simplicity of each word, grammatical structures, or the presence of filler words (e.g., “um,” “uh,” “er,” etc.). If small or simple words are used, or if a large number of filler words are used close together, audio processing circuitry 408 may determine that the language usage level is low, meaning that the speaker of the words is most likely a child. If larger, more technical words are used, or if the grammatical structures used are more complex, audio processing circuitry 408 may determine that the language usage level is high.

At 1006, control circuitry 406 initializes a counter variable N, setting its value to one, and a variable T, representing the number of known users for whom voice profiles have been stored. At 1008, control circuitry 406 compares the language usage level with an age of the N^(th) user. For example, a profile of the N^(th) user may include age information. Control circuitry 406 may associate a particular language usage level with an age range. At 1010, control circuitry 406 determines, based on the comparison, whether the language usage level matches the age of the N^(th) user. For example, if the age of the user falls within the age range associated with the language usage level, then the N^(th) user's age matches the language usage level. If the N^(th) user's age matches the language usage level (“Yes” at 1010), then, at 1012, control circuitry 406 identifies the first voice signal as corresponding to the N^(th) user. If the language usage level does not match the age of the N^(th) user (“No” at 1010), then, at 1014, control circuitry 406 determines whether N is equal to T, meaning that the language usage level have been compared to each known user. If not (“No” at 1014), then, at 1016, control circuitry 406 increments the value of N by one, and processing returns to step 1008. If so (“Yes” at 1014), then the process ends.

The actions and descriptions of FIG. 10 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 10 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 11 is a flowchart representing an illustrative process 1100 for filtering unwanted sounds from a conference call using speech synthesis, in accordance with some embodiments of the disclosure. Process 1100 may be implemented on control circuitry 406. In addition, one or more actions of process 1100 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 1102, control circuitry 406 captures a first voice signal during a first conference call. At 1104, control circuitry 406, using audio processing circuitry 408, converts the first voice signal into corresponding text, which may be accomplished using any known speech-to-text technique. At 1106, control circuitry 406 analyzes the text to determine that a first portion of the text was spoken by a first user and that a second portion of the text was spoken by a second user. For example, control circuitry 406, using audio processing circuitry 408, may determine that some words were spoken at a different frequency or with a different rate, accent, intonation, or pitch. Alternatively or additionally, using natural language processing functions of audio processing circuitry 408, control circuitry 406 may identify multiple language usage levels or multiple subjects within the text.

At 1108, control circuitry 406 initializes a first Boolean variable R₁, setting its value to FALSE, and a second Boolean variable R₂, also setting its value to FALSE. At 1110, control circuitry 406 determines whether the first user is relevant to the conference call. For example, control circuitry 406 may access data relating to the conference call, such as a meeting invitation, or metadata of the active conference call to determine a subject of the conference call. Control circuitry 406 then compares the portion of text spoken by the first user with the subject of the conference call. Alternatively, control circuitry 406 may determine whether the first user received an invitation to the conference call. For example, control circuitry 406 may access an email account or calendar of the first user to determine if any messages or entries relating to the conference call are present. If the first user is determined to be relevant to the conference call using any of these methods, then, at 1112, control circuitry 406 sets the value of R₁ to TRUE. Otherwise, the value of R₁ remains FALSE. In either case, processing proceeds to 1114, at which a similar determination is made for the second user. If the second user is determined to be relevant to the conference call, then, at 1114, control circuitry 406 sets the value of R₂ to TRUE. Otherwise, the value of R₂ remains FALSE. In either case, processing proceeds to 1118.

At 1118, control circuitry 406 prevents the first voice signal from being transmitted into the conference call. For example, control circuitry 406 may instruct audio processing circuitry 408 not to transmit the first voice signal to transceiver circuitry 416. At 1122, control circuitry 406 determines whether the R₁ is TRUE. If so (“Yes” at 1120), then, at 1122, control circuitry 406, using audio processing circuitry 408, converts the first portion of the text to a second voice signal. For example, audio processing circuitry 408 retrieves a voice profile of the first user and, using known text-to-speech techniques, synthesizes the first portion of the text to a corresponding voice signal in the voice of the first user. Then, at 1124, control circuitry 406 transmits the second voice signal into the conference call.

After transmitting the second voice signal into the conference call, or if R₁ is FALSE (“No” at 1120), at 1126, control circuitry 406 determines whether R₂ is TRUE. If so (“Yes” at 1126), then, at 1128, control circuitry 406, using audio processing circuitry 408, converts the second portion of the text to a third voice signal. For example, audio processing circuitry 408 retrieves a voice profile of the second user and, using known text-to-speech techniques, synthesizes the second portion of the text to a corresponding voice signal in the voice of the second user. Then, at 1130, control circuitry 406 transmits the third voice signal into the conference call. The second and third voice signal may be multiplexed together in a single transmission. If R₂ is FALSE (“No” at 1126), then the process ends.

The actions and descriptions of FIG. 11 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 11 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 12 is a flowchart representing an illustrative process 1200 for determining whether a user is relevant to a conference call, in accordance with some embodiments of the disclosure. Process 1200 may be implemented on control circuitry 406. In addition, one or more actions of process 1200 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 1202, control circuitry 406 retrieves a first user profile of the first user and a second user profile of the second user. At 1204, control circuitry 406 identifies a subject of the conference call. For example, control circuitry 406 may access metadata of the conference call or meeting invitation data from an email account or calendar of a user. At 1206, control circuitry 1206 determines whether the first user is familiar with the subject of the conference call. For example, the first user profile may include a list of subjects with which the first user is familiar. Control circuitry 406 may determine if the identified subject of the conference call is contained in the list of subjects. If the first user is familiar with the subject of the conference call (“Yes” at 1206), then, at 1208, control circuitry 406 sets the value of R₁ to TRUE. At 1210, control circuitry 406 also determines whether the second user is familiar with the subject of the conference call using similar methods. If so (“Yes” at 1210), then, at 1212, control circuitry 406 sets the value of R₂ to TRUE.

The actions and descriptions of FIG. 12 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 12 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 13 is a flowchart representing a second illustrative process 1300 for determining whether a user is relevant to a conference call, in accordance with some embodiments of the disclosure. Process 1300 may be implemented on control circuitry 406. In addition, one or more actions of process 1300 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 1302, control circuitry 406 identifies a first account associated with the first user. For example, control circuitry 406 may identify an email account, calendar account, social media account, or other account or profile of the first user. At 1304, control circuitry 406 identifies a second account associated with the second user. This may be similar to the first account of the first user. At 1306, control circuitry 406 determines whether the first user received an invitation to the conference call. For example, control circuitry 406 may determine if the identified account contains an entry or message identifying the conference call in particular, or a meeting taking place at the same time as the conference call in general. If the first user received an invitation to the conference call (“Yes” at 1306), then, at 1308, control circuitry 406 sets the value of R₁ to TRUE. At 1310, control circuitry 406 also determines whether the second user received an invitation to the conference call using similar methods. If so (“Yes” at 1310), then, at 1312, control circuitry 406 sets the value of R₂ to TRUE.

The actions and descriptions of FIG. 13 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 13 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

FIG. 14 is a flowchart representing an illustrative process 1400 for presenting participants in a conference call with an option to select to listen to one of two voice signals, in accordance with some embodiments of the disclosure. Process 1400 may be implemented on control circuitry 406. In addition, one or more actions of process 1400 may be incorporated into or combined with one or more actions of any other process or embodiment described herein.

At 1402, control circuitry 406 converts the first portion of the text into a second voice signal and, at 1404, converts the second portion of the text into a third voice signal. These actions may be accomplished using methods described above in connection with FIG. 11. At 1406, control circuitry 406 transmits the second voice signal into the conference call and, at 1408, transmits the third voice signal into the conference call, separately from the second voice signal. At 1410, an option is presented to other participants in the conference call to select whether to listen to the second voice signal or the third voice signal. For example, an icon or avatar of each of the first and second users may be displayed to other participants. Selection of the icon or avatar of one user will cause the appropriate voice signal to be played.

The actions and descriptions of FIG. 14 may be used with any other embodiment of this disclosure. In addition, the actions and descriptions described in relation to FIG. 14 may be done in suitable alternative orders or in parallel to further the purposes of this disclosure.

The processes described above are intended to be illustrative and not limiting. One skilled in the art would appreciate that the steps of the processes discussed herein may be omitted, modified, combined, and/or rearranged, and any additional steps may be performed without departing from the scope of the invention. More generally, the above disclosure is meant to be exemplary and not limiting. Only the claims that follow are meant to set bounds as to what the present invention includes. Furthermore, it should be noted that the features and limitations described in any one embodiment may be applied to any other embodiment herein, and flowcharts or examples relating to one embodiment may be combined with any other embodiment in a suitable manner, done in different orders, or done in parallel. In addition, the systems and methods described herein may be performed in real time. It should also be noted that the systems and/or methods described above may be applied to, or used in accordance with, other systems and/or methods. 

What is claimed is:
 1. A method comprising: capturing a first voice signal, the first voice signal comprising a voice of a first user and a voice of a second user, by a first device, during a conference call; converting the first voice signal into corresponding text; analyzing the text to determine that a first portion of the text was spoken by the first user, and a second portion of text was spoken by the second user; determining whether the first user is relevant to the conference call, and whether the second user is relevant to the conference call; and in response to determining that the first user is relevant to the conference call, and that the second user is not relevant to the conference call: preventing the first voice signal, the first voice signal comprising the voice of the first user and the voice of the second user, from being transmitted into the conference call; converting the first portion of the text to a second voice signal; and transmitting the second voice signal into the conference call.
 2. The method of claim 1, wherein the second portion of the text is not converted to a voice signal and is not transmitted into the conference call.
 3. The method of claim 1, wherein converting the first portion of the text into a second voice signal comprises: retrieving a voice profile of the first user; and synthesizing the first portion of the text into a voice of the first user based on the voice profile.
 4. The method of claim 1, wherein determining whether the first user is relevant to the conference call and whether the second user is relevant to the conference call comprises: retrieving a first user profile of the first user and a second user profile of the second user; identifying a subject of the conference call; determining, based on the first user profile, whether the first user is familiar with the subject of the conference call; and determining, based on the second user profile, whether the second user is familiar with the subject of the conference call.
 5. The method of claim 1, wherein determining whether the first user is relevant to the conference call and whether the second user is relevant to the conference call comprises: identifying a first account associated with the first user; identifying a second account associated with the second user; determining whether the first account received an invitation to the conference call; and determining whether the second account received an invitation to the conference call.
 6. The method of claim 1, further comprising converting the second portion of the text to a second voice signal by: retrieving a voice profile of the second user; and synthesizing the second portion of the text into a voice of the second user based on the voice profile.
 7. The method of claim 1, wherein the preventing the first voice signal, the first voice signal comprising the voice of the first user and the voice of the second user, from being transmitted into the conference call further comprises: preventing transmission into the conference call of all voices present in the first voice signal.
 8. The method of claim 1, further comprising: converting the second portion of the text to a third voice signal; transmitting the third voice signal into the conference call separately from the second voice signal; and presenting, to other participants in the conference call, an option to select whether to listen to the second voice signal or the third voice signal.
 9. A system comprising: audio input circuitry configured to capture voice signals; and control circuitry configured to: capture, using the audio input circuitry, a first voice signal, the first voice signal comprising a voice of a first user and a voice of a second user, during a conference call; convert the first voice signal into corresponding text; analyze the text to determine that a first portion of the text was spoken by the first user, and a second portion of text was spoken by the second user; determine whether the first user is relevant to the conference call, and whether the second user is relevant to the conference call; and in response to determining that the first user is relevant to the conference call, and that the second user is not relevant to the conference call: prevent the first voice signal, the first voice signal comprising the voice of the first user and the voice of the second user, from being transmitted into the conference call; convert the first portion of the text to a second voice signal; and transmit the second voice signal into the conference call.
 10. The system of claim 9, wherein the second portion of the text is not converted to a voice signal and is not transmitted into the conference call.
 11. The system of claim 9, wherein the control circuitry configured to convert the first portion of the text into a second voice signal is further configured to: retrieve a voice profile of the first user; and synthesize the first portion of the text into a voice of the first user based on the voice profile.
 12. The system of claim 9, wherein the control circuitry configured to determine whether the first user is relevant to the conference call and whether the second user is relevant to the conference call is further configured to: retrieve a first user profile of the first user and a second user profile of the second user; identify a subject of the conference call; determine, based on the first user profile, whether the first user is familiar with the subject of the conference call; and determine, based on the second user profile, whether the second user is familiar with the subject of the conference call.
 13. The system of claim 9, wherein the control circuitry configured to determine whether the first user is relevant to the conference call and whether the second user is relevant to the conference call is further configured to: identify a first account associated with the first user; identify a second account associated with the second user; determine whether the first account received an invitation to the conference call; and determine whether the second account received an invitation to the conference call.
 14. The system of claim 9, wherein the control circuitry is further configured to convert the second portion of the text to a second voice signal by: retrieving a voice profile of the second user; and synthesizing the second portion of the text into a voice of the second user based on the voice profile.
 15. The system of claim 9, wherein the control circuitry is further configured to, when preventing the first voice signal, the first voice signal comprising the voice of the first user and the voice of the second user, from being transmitted into the conference call, prevent transmission into the conference call of all voices present in the first voice signal.
 16. The system of claim 9, wherein the control circuitry is further configured to: convert the second portion of the text to a third voice signal; transmit the third voice signal into the conference call separately from the second voice signal; and present, to other participants in the conference call, an option to select whether to listen to the second voice signal or the third voice signal.
 17. A system comprising: means for capturing a first voice signal, the first voice signal comprising a voice of a first user and a voice of a second user, by a first device, during a conference call; means for converting the first voice signal into corresponding text; means for analyzing the text to determine that a first portion of the text was spoken by the first user, and a second portion of text was spoken by the second user; means for determining whether the first user is relevant to the conference call, and whether the second user is relevant to the conference call; and means for, in response to determining that the first user is relevant to the conference call, and that the second user is not relevant to the conference call: preventing the first voice signal, the first voice signal comprising the voice of the first user and the voice of the second user, from being transmitted into the conference call; converting the first portion of the text to a second voice signal; and transmitting the second voice signal into the conference call.
 18. The system of claim 17, wherein the second portion of the text is not converted to a voice signal and is not transmitted into the conference call.
 19. The system of claim 17, wherein the means for converting the first portion of the text into a second voice signal comprises: means for retrieving a voice profile of the first user; and means for synthesizing the first portion of the text into a voice of the first user based on the voice profile.
 20. The system of claim 17, wherein the means for determining whether the first user is relevant to the conference call and whether the second user is relevant to the conference call comprises: means for retrieving a first user profile of the first user and a second user profile of the second user; means for identifying a subject of the conference call; means for determining, based on the first user profile, whether the first user is familiar with the subject of the conference call; and means for determining, based on the second user profile, whether the second user is familiar with the subject of the conference call. 